# UNIX signals

This topic examines UNIX signals in relationship to the
D3 virtual machine.

The discussion is intended for experienced UNIX programmers
to interface UNIX applications with D3 or to use UNIX process synchronization
in a purely D3 environment.

For performance reasons, UNIX signals
are not used in regular D3 activity. They are used solely to handle
exceptions. Diverting signal usage for an application would remove
nonessential facilities, such as sending messages or logging off a
process. This does not mean that signals can be used freely, though.
The D3 monitor provides a system call to process regular D3 signals
inside a customized signal handler, thus combining system and application
signal handling.

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Source: https://d3codex.com/unix/unix-signals/ - part of the D3Codex reference.